PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-23:12:40
G02     201.2          29.5               19.1 +/-    1.71      33.8 +/-    1.71  0.110 / 0.410
G06     165.9          62.7               16.1 +/-    0.94      17.9 +/-    0.94  0.130 / 0.390
G12     304.1          10.6               -4.3 +/-   20.91     -11.9 +/-   20.91  0.050 / 0.090
G17     24.7           57.3               13.1 +/-    0.45      15.2 +/-    0.45  0.060 / 0.090
G19     343.7          68.6               12.1 +/-    0.63      12.9 +/-    0.63  0.070 / 0.140
G24     304.1          34.7               11.1 +/-    0.61      17.8 +/-    0.61  0.090 / 0.140
G28     96.7           34.8               12.8 +/-    0.95      20.4 +/-    0.95  0.050 / 0.150